Process of obtaining ammonia from gas.



G. HILGENSTOUK. PROCESS OF OBTAINING AMMONIA FROM GAS. AIPLYIOATION FILED SEPT. 15,1910.

Patented June 2,1914.

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ammohiaahsoi'hing meuiuui. with the gas lili its

it pgrieatieii filecl Septemher Speelileetion. 01 Let Merr e tEZ-UEPEAV lHllLGENfiTOUK, Q33 131531331 51 h whom it may concern lie it Known thut l, G'Us'iuw .llYLGErIS'LOUK; geet oi: the limo; of Prussia, Emperor e suh' H oi: tieriuauy and resident of l.)ah1heesen-' sie, Germany, have invented certain new and useful improve-ments in the ?roeess oi Uhtaihiiig Ammonia from ties, of. which the following is a specification.

According to my improved preeess the is freed from the greater portion of its tar While at or somewhat above its dew point tom eralure and is then ceutaeteil with acid or aeicl lye, maintained zit a, temperature above the dew point of such hy heat taken from the gas itself hetero sueh s has been suhjeetecl to the removal treatment. B maintaining the ammoniaahsorhiteg medium at a temperature above the dew point of the gas, I avoid COIMlGUSKL" tion in such ani'monia-absorbiug motliuiu of the moisture carried by the gas and; so iLVOlfl dilution of such aiiimonie-absorhing uieciium. by eoeclensecl moisture.

The seeemlmnyiiug drawing; illustrates more or less diagrammatieally and iii verti eal section, apperatusfor carrying out my said process. in seicl apparatus l have ill ustrated means for removal oi": the tor, a, iieviee of the injector type, wherein the Washecl with tar or with water containing 1; such tar extraetiu device being; pertieulerly eiheieiit for the purpose; and l have Ltuither lllUStfitttBLh means for centeeting the gas with the ammonia-ahsorhiiig zoo-- an tank containing the ammonia-ahwhiny; niecliui'n, and SULL'OUIKlCCl by a jacket through which the gas flows on its way to the tar extractor, and an iu ieetor to which the ummmile-absorbing medium is supplied by suitable means, and which. mingles sueh homing from the tar extractor; the nii atui'e oi .llu ammoniaehsorbing medium and gas hoiuo; thence delivered into said tank at a, point below the level of the liquid therein,

in the (lira Wing,

oi tar exttie pressure pipe 7 of n: being eeimeetecl in the tarare freed com.- us of the injected thee Vemlueteil through the upper r of the tank 8 and pipe glto the mix fit hieh is shaped like an 'llljGCljOl', lee aeirl or acid. lye which is its operatl brought by a ll through pressure pipe 10 there will he an intivu- ,u the absorbing liquid the ammonia in the g: s eom ,h the acid. oi? the liquid and goes latter to the ieeeiviiig taelt The i It serrated pi qe iiipiiquhl whereby it is and finally leaves the hi by u v et nozzle 14:

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plewly .1 ow uiiil wi t h Vt'h-w to he hr ll'u 'ltlt? fixetlfievel 0y means of the overflow 15., which in turn eoueeeis with pipl', the latter being seafitu in ti e overlio zvieg lye in the tank ii Tank 1? ui'vicletl by a, parti tieu into two compartments l9 and 20, wl em con th one another umlerneeth l rom the vessel 3 not the 1" only 'ye out also so) .i (iliililtltlBS of tar or tiili" l uitlli this off; the tar having a lesser speeuie gravity 3 n the lye ascends to the surtaee M1 the c. r other 1% it is latlletl out or overflows ihmu gl eipe The lye tree of :-:-1 mulei'ut to the rmrtitien into the 'oiu there through opening 42 into the i l By means of suction pipe file? the outer eonueeted to the centi-i iugg al gm '1 ll and. the lye is eoiiti umusly Yul to the iiijeetor or ammonia, separator 10. The con, ant reuewat of the aeiti in 'the lye tat place in the through pipe 25. the ammonia, salt which is eliminated in the tank 2' anal (selle- RIHWCLl hy uuaus oi. JG Ujet. in a eentritugal inaehiue.

l vario practical ieuseims the separation m? r from. the gas is host conducted at a temperature at or only slightly above the dew point of the gus -that is to say, at or slightly above the temperature at ii hieh the principal part at the moisture carried by the eomienses. lleuee in the operation =ueh that illustrated, the temperature of the wishing liquor is customarily regulated that the extraction of ,s at its bottom is reor anal dried R 3'; t 1e lye is kept on a ill) the tar is con-ducted at atemperature only and would be absorbed by the liquid in tank 3, so diluting such liquid. Such dilution I avoid by passing the hot gases through the jacket 2 before such gases reach the tar extractor; and thereby I maintain the temperature of the ammonia-absorbing medium well above the dew point of the gas, and so avoid dilution of such ammonia-absorbing medium.

What I claim is: 1. The process of extracting ammonia .from gases resulting from distillation of carloonaceous material, which comprises removing tar from such gases at a temperature near the dew point for contained Water vapor of such gases, and then contacting the gases with an ammoniaabsorbing medium, and maintaining such ammonia-absorbing messes medium at a temperature Well above such dew point or the gases, by passing said gases, while hot, and before the tar removal treatment, into heating proximity to the ammonia-absorbing medium.

2. The process of extracting ammonia from gases resulting from distillation of carbonaceous material, which comprises rcmoving tar from such gases at artern erature near the dew point for contains water vapor of such gases, by washing said gases with tar or tarry liquor, and thence passing said gases into an ejector and there mingling them with injected acid or acid lye main- 4 tained at a temperature Well above such dew oint of such ases and senaratin the ami monia-carrying 'lye from the remaining gases.

In testimony whereof I have signed this specification in the presence of two subscrib- 45 ing witnesses.

'GUSTAV HILGENSTOCK. Witnesses:

ANNA BEINHOLD, WILHELMINE Sculim. 

